Troops from the Chinese People's Armed Police Force and the Russian National Guard conducted exercises on jointly cleaning up terrorist groups in simulated situations, such as a bus hijacking.
Trump is currently trailing 2020 Democratic presidential nominee and former US Vice President Joe Biden nationally by 10 points, according to a pair of polls released on Wednesday. Surveys showed tight races in a number of key battleground states, where the two rivals have made frequent campaign stops.
Trump is the "wrong president for our country," she said in pretaped remarks, adding that he is "clearly in over his head".
Trump canceled a formal meeting with Putin in Buenos Aires in December last year, citing mounting tensions between Russia and Ukraine.
Trump’s tweets about Bezos and Amazon before his presidential campaign had a much different tone.
Trump announced last week a surprise decision to withdraw troops from Syria, where US has backed the Syrian Kurdish People's Protection Units (YPG) militia against Islamic State (IS).
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Trump faces token opposition in the Republican primaries.
Trump tweeted earlier on Thursday that the highly anticipated meeting between Kim Jong-un and himself will take place in Singapore on June 12, and said," We will both try to make it a very special moment for World Peace!"
Trump also noted that he is seriously considering visiting Poland in September.
Trump said the US is taking a "hard look" at its foreign assistance to countries that don't have American interests "at heart".